Generator Sets For Sale

New or Used Generators (Gen Set) by Owners and Dealers

Generator sets, also known as a "gen set", can provide power to any job site that is not connected to grid, needs an emergency supply, or wants to perform peak shaving. The generators come in various sizes and power ratings. The fuel type of the generator may be diesel, gasoline, or natural gas, and they may be trailer-mounted, mobile, or stationary. If you're looking for just a power unit, browse our industrial power unit section.
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1-25 of 1,954 results
1-25 of 1,954 results
Featured Item
Doosan G325WCU-3A Diesel Generator
8 4

2012 Doosan G325WCU-3A Diesel Generator

$65,000 USD
2012 Doosan G325WCU-3A Generator, Only 4,472 Hrs., Cummins QSL9-GB Diesel Engine, Ready to Work!, Call Christopher Lillo 310~977~7903,
ConditionUsed
Usage4,472 Hours
Stock NumberCA05042025CL
MLS Number13558814
CategoryGenerator Sets
Last Updated7/22/2025
Location
Los Angeles, CA, US
Sold By

Lillo Machinery, Inc.

Featured Item
Marathon Generator - MARATHON ELECTRIC MOTOR -480Volts/150Amps
6 0

Marathon Generator - MARATHON ELECTRIC MOTOR -480Volts/150Amps

$4,500 USD
MagnaMax AC generator 480Volts/150Amps
ConditionUsed
Attachment MakeMarathon Electric
MLS Number10674696
CategoryGenerator Sets
Last Updated7/24/2025
Location
Middleton, WI, US
Sold By

NORTHWESTERN STONE LLC

Caterpillar 3412 Generator
5 0

2012 Caterpillar 3412 Generator

Recently Updated
$101,339.55 USD
Online Owner's Manual,
ConditionUsed
Usage1,023 Hours
Stock Number000000000010466338
MLS Number12295802
CategoryGenerator Sets
Last Updated8/10/2025
Location
Madrid, Spain
Sold By

Barloworld Finanzauto

Caterpillar XQ35KVA Generator
5 0

2020 Caterpillar XQ35KVA Generator

Recently Updated
$23,900 USD
3 PHASE NEMA LOCK RECEPTACLE, 3POLE CB W/ CAMLOCK CONNT OPTION, 60 HZ 27 KW, 60HZ 480 VOLT (WYE), 80C TEMP RISE OVER 40C AMB, ALT SPACE HEATER, Base Type - Standard, BATTERY CHARGER UL10A...
ConditionUsed
Usage5,472 Hours
Stock NumberWEU0056
MLS Number12224697
CategoryGenerator Sets
Last Updated8/10/2025
Location
Call Foley, KS, US
Sold By

Foley Equipment

Caterpillar XQ35KVA Generator
4 0

2020 Caterpillar XQ35KVA Generator

Recently Updated
$27,500 USD
2020 CAT XQ35KVA, DIESEL FUEL 30KW GENSET, KS TAG 180346, Online Owner's Manual, VIN# 7KUBB121XLJ089647,
ConditionUsed
Usage3,100 Hours
Stock NumberVER003
MLS Number12769345
CategoryGenerator Sets
Last Updated8/10/2025
Location
Kansas City, MO, US
Sold By

Foley Equipment

Perkins DBP10000DC1 Generator
1 0

Perkins DBP10000DC1 Generator

Recently Updated
$10,649 USD
NEW - 10KW GENSET EPA COMPLIANT / PORTABLE GENERATOR-USA-TM, WITH ONE YEAR + FACTORY WARRANTY, INCLUDES FREE SHIPPING US48. 10 KW OPEN UNIT.
ConditionNew
Stock Number9450
MLS Number13354161
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Perkins DBK8000D01 Generator
1 0

Perkins DBK8000D01 Generator

Recently Updated
$11,595 USD
NEW - 8KW- GENSET EPA COMPLIANT / PORTABLE GENERATOR-USA-TM, WITH ONE YEAR + FACTORY WARRANTY INCLUDES FREE SHIPPING US48. 8KW OPEN UNIT.
ConditionNew
Stock Number9451
MLS Number13354160
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Perkins DBP10000D01 Generator
2 0

Perkins DBP10000D01 Generator

Recently Updated
$12,995 USD
ENCLOSED UNIT- NEW - 10KW GENSET - EPA COMPLIANT / PORTABLE GENERATOR-USA-TM, WITH ONE YEAR + FACTORY WARRANTY INCLUDES FREE SHIPPING US48. 10 KW ENCLOSED UNIT.
ConditionNew
Stock Number9452
MLS Number13354159
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Caterpillar C18 Generator
3 0

2008 Caterpillar C18 Generator

Recently Updated
$119,995 USD
600KW- COMPLETE ModelSR4B, Serial9F603025, Hertz60HzWires6 WireKilo Watts, 600 kW, MountedSkid, AR#272-6915, TIER 3. WITH 100 DAY LIMITED PARTS WARRANTY,
ConditionNew
Stock Number69073
MLS Number13353024
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Caterpillar 3412 Generator
7 0

2001 Caterpillar 3412 Generator

Recently Updated
$132,995 USD
LIKE NEW ONLY 208 HOURS, CAT 750 COMPLETE Sound Enclosed with, Base Fuel Tank, with 100 day limited parts warranty Unit will be load tested before shipment.
ConditionUsed
Stock Number69145
MLS Number13353017
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Cummins KTA38-G2 Generator
5 0

Cummins KTA38-G2 Generator

Recently Updated
$37,995 USD
LIKE NEW ONLY 250 HOURS ON EACH OF THESE TWO KTA3-G2 COMPLETE GENSETS. WITH WARRANTY. SELLING AS PACKAGE OF TWO AT $75,000.00 CALL OR SEND FOR DETAILS.
Quantity2
ConditionUsed
Stock Number69171
MLS Number13353015
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Cummins 6CT8.3-G Generator
6 0

Cummins 6CT8.3-G Generator

Recently Updated
$16,995 USD
135 KW-COMPLETE GENSET LIKE NEW ONLY 300 HOURS SINCE NEW. engine driven radiator, base fuel tank, skid mounted, Control panel and breaker. 100 DAY LIMITED PARTS WARRANTY.
ConditionUsed
Stock Number69263
MLS Number13352990
CategoryGenerator Sets
Last Updated8/9/2025
Location
Chicago, IL, US
Sold By

Diesel Sales

Caterpillar 3508B Generator
19 0

2001 Caterpillar 3508B Generator

Newly Listed
$155,000 USD
ConditionUsed
Usage262 Hours
Stock NumberEPU11446
MLS Number13751637
CategoryGenerator Sets
Last Updated8/9/2025
Location
Indianapolis, IN, US
Sold By

MacAllister Machinery - South

Caterpillar XQ500 - 600 Generator
4 0

2014 Caterpillar XQ500 - 600 Generator

Newly Listed
$235,931.37 USD
Hitch, Trailer,
ConditionUsed
Usage8,222 Hours
Stock NumberRE13155C
MLS Number13751494
CategoryGenerator Sets
Last Updated8/9/2025
Location
Quebec City, QC, Canada
Sold By

Toromont Power Systems

Generac 500 KW Generator
5 0

2006 Generac 500 KW Generator

Newly Listed
Contact for price
380 Hours, Fuel Type: Diesel, Capacity: 500
ConditionUsed
Usage380 Hours
Engine ModelP180LE
Stock Number92469
MLS Number13751210
CategoryGenerator Sets
Last Updated8/9/2025
Location
Brighton, CO, US
Sold By

Generator Source

Caterpillar 500 KW Generator
6 0

1997 Caterpillar 500 KW Generator

Newly Listed
Contact for price
319 Hours, Fuel Type: Diesel, Capacity: 500
ConditionUsed
Usage319 Hours
Engine ModelCaterpillar 3412
Stock Number92091
MLS Number13751208
CategoryGenerator Sets
Last Updated8/9/2025
Location
Brighton, CO, US
Sold By

Generator Source

Caterpillar 500 KW Generator
1 0

1998 Caterpillar 500 KW Generator

Newly Listed
Contact for price
1652 Hours, Fuel Type: Diesel, Capacity: 500
ConditionUsed
Usage1,652 Hours
Engine ModelCaterpillar 3412
Stock Number90668
MLS Number13751201
CategoryGenerator Sets
Last Updated8/9/2025
Location
Jacksonville, FL, US
Sold By

Generator Source

Caterpillar 550 KW Generator
5 0

2018 Caterpillar 550 KW Generator

Newly Listed
Contact for price
245 Hours, Fuel Type: Diesel, Capacity: 550
ConditionUsed
Usage245 Hours
Engine ModelCaterpillar C18
Stock Number92025
MLS Number13751198
CategoryGenerator Sets
Last Updated8/9/2025
Location
Brighton, CO, US
Sold By

Generator Source

Kohler 600 KW Generator
6 0

2015 Kohler 600 KW Generator

Newly Listed
Contact for price
144 Hours, Fuel Type: Diesel, Capacity: 600
ConditionUsed
Usage144 Hours
Engine ModelVolvo FVPXL16.1ACW
Stock Number92298
MLS Number13751197
CategoryGenerator Sets
Last Updated8/9/2025
Location
Brighton, CO, US
Sold By

Generator Source

Katolight 600 KW Generator
4 0

2007 Katolight 600 KW Generator

Newly Listed
Contact for price
203 Hours, Fuel Type: Diesel, Capacity: 600
ConditionUsed
Usage203 Hours
Engine ModelMitsubishi S6R-Y2PTAW
Stock Number92018
MLS Number13751196
CategoryGenerator Sets
Last Updated8/9/2025
Location
Jacksonville, FL, US
Sold By

Generator Source

Caterpillar 600 KW Generator
5 0

2001 Caterpillar 600 KW Generator

Newly Listed
Contact for price
523 Hours, Fuel Type: Diesel, Tandem Rear Axles, Capacity: 600
ConditionUsed
Usage523 Hours
Engine ModelCaterpillar 3412
Rear AxleTandem Axle
Stock Number90971
MLS Number13751195
CategoryGenerator Sets
Last Updated8/9/2025
Location
Jacksonville, FL, US
Sold By

Generator Source

Generac 600 KW Generator
5 0

2006 Generac 600 KW Generator

Newly Listed
Contact for price
476 Hours, Fuel Type: Diesel, Capacity: 610
ConditionUsed
Usage476 Hours
Engine ModelP222LE
Stock Number90908
MLS Number13751194
CategoryGenerator Sets
Last Updated8/9/2025
Location
Brighton, CO, US
Sold By

Generator Source

Kohler 1000ROZM Diesel Generator
9 0

2000 Kohler 1000ROZM Diesel Generator

Recently Updated
$69,900 USD
Kohler 1020kW standby (925 kW prime) diesel generator set, model 1000ROZM, SN-0681007. Mitsubishi S12H-PTA engine rated 1448 HP at 1800 RPM, SN-30244. 3/60/277/480V. No circuit breaker. PMG ...
ConditionUsed
Usage503 Hours
Horse Power1448 HP
Engine ModelMitsubishi S12H-PTA
Stock NumberCentral States #4735
MLS Number13730094
CategoryGenerator Sets
Last Updated8/9/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Caterpillar 3512C Diesel Generator
11 0

2009 Caterpillar 3512C Diesel Generator

Recently Updated
$389,900 USD
Caterpillar 1500 kW standby (1360 kW prime) diesel generator set, SN-SBG00350. CAT 3512C engine rated 2206 HP at 1800 RPM, SN-EBG00281, EPA Tier 2 emissions. 3//60/277/480V. 3 x 1200 Amp...
ConditionUsed
Usage585 Hours
Horse Power2206 HP
Engine ModelCaterpillar 3512C
Emission RatingUSA Tier 2
Stock NumberCentral States #4720
MLS Number13558438
CategoryGenerator Sets
Last Updated8/9/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Kohler 515 KW Generator
6 0

1997 Kohler 515 KW Generator

Recently Updated
Contact for price
375 Hours, Fuel Type: Diesel, Capacity: 515
ConditionUsed
Usage375 Hours
Engine ModelDetroit R0837K06
Stock Number91385
MLS Number13305868
CategoryGenerator Sets
Last Updated8/9/2025
Location
Jacksonville, FL, US
Sold By

Generator Source

Did you find what you were looking for? Yes No

The Marketplace for Buying and Selling Industrial Generators

A generator set, aka a "gen set", can provide power to any job site that is not connected to grid or otherwise needs an emergency supply. In addition, a gen set can save money by producing power during peak hours when energy costs the most (a practice known as “peak shaving”). We are pleased to offer a huge listing of gas, natural gas, and diesel generator sets for all of your power supply needs.

Choosing the Right Gen Set

A gen set can be split into three main types:

  • Diesel Generator Sets – A diesel genset has better fuel efficiency than a gas gen set, but usually cost more. Earlier models are much noisier than modern versions.
  • Gasoline Generator Sets – Although less expensive than diesel, their components are actually more expensive to replace. More popular than diesel when it comes to intermittent use.
  • Natural Gas – The most expensive gen set to operate is also potentially explosive, so caution must be taken at all times. However, since many buildings have a natural gas line, you usually won’t need to store fuel.

Whether you choose a natural gas, gasoline, or diesel genset, you will need to decide on the best cooling system. Again, there are three types:

  • Air-cooled – The loudest and cheapest cooling system with low maintenance costs (typically received for smaller generator sets).
    Typically used for power levels ranging from 8 to 20 kilowatts.
  • Water-cooled – Larger generator sets require liquid cooling, which is quieter than air, but also more complex and oftentimes messier.
    Typically used for power levels ranging from 25 to 60 kilowatts.
  • Hydrogen – The most powerful gen set is also the most dangerous; hydrogen is highly combustible and most be closely monitored.
    Typically used for power levels above 60 kilowatts.
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